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Communication: New approach for analysis of thermodiffusion coefficients in ternary mixtures
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Figures

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FIG. 1.

Schematic representation of compared measurement techniques. (a) Thermogravitational column, (b) optical beam deflection, and (c) optical digital interferometry. Values which are measured by techniques are marked by bold red bars and parameters to which they correspond are indicated nearby.

Image of FIG. 2.

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FIG. 2.

Graphical presentation of all experimental results for THN-IBB-nC12 mixture at the symmetric point. The open circles show pairs provided by the authors 4,8 and filled circles indicate the trustworthy joint solution.

Tables

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Table I.

Summary of analyzed experiments. λ1 = 589 nm, λ2 = 405 nm, λ3 = 633 nm, and λ4 = 670 nm.

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Table II.

Results provided by all possible diagnostics combinations. λ1 = 589 nm, λ2 = 405 nm, λ3 = 633 nm, and λ4 = 670 nm.

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/content/aip/journal/jcp/138/16/10.1063/1.4802987
2013-04-25
2014-04-21

Abstract

A new approach is proposed to cross-check conflicting measured values of the thermodiffusion coefficients in ternary mixtures. The results of recent measurements performed in ternary mixture of hydrocarbons 1,2,3,4-tetrahydronaphthalene, isobutylbenzene, and dodecane by thermogravitational column [P. Blanco, M. M. Bou-Ali, J. K. Platten, D. A. de Mezquia, J. A. Madariaga, and C. Santamaría, J. Chem. Phys.132, 114506 (Year: 2010)10.1063/1.3354114] and optical beam deflection [A. Königer, H. Wunderlich, and W. Köhler, J. Chem. Phys.132, 174506 (Year: 2010)10.1063/1.3421547] are critically analyzed. A way of matching them into a unique value is reported. The accuracy of the integrated value should significantly exceed that of the original results. Two diagnostics are required to determine thermodiffusion coefficients in ternary mixture, e.g., two different wavelengths or density and refractive index. It is shown that by attributing a reliability weight for each pair of diagnostics among the available techniques the best combination can be selected. The true values of thermodiffusion coefficients are extremely sensitive to the knowledge of precise values of mass diffusion coefficients and contrast factors.

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Scitation: Communication: New approach for analysis of thermodiffusion coefficients in ternary mixtures
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/16/10.1063/1.4802987
10.1063/1.4802987
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